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<FONT color="green">001</FONT>    /*<a name="line.1"></a>
<FONT color="green">002</FONT>     * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a>
<FONT color="green">003</FONT>     * contributor license agreements.  See the NOTICE file distributed with<a name="line.3"></a>
<FONT color="green">004</FONT>     * this work for additional information regarding copyright ownership.<a name="line.4"></a>
<FONT color="green">005</FONT>     * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.5"></a>
<FONT color="green">006</FONT>     * (the "License"); you may not use this file except in compliance with<a name="line.6"></a>
<FONT color="green">007</FONT>     * the License.  You may obtain a copy of the License at<a name="line.7"></a>
<FONT color="green">008</FONT>     *<a name="line.8"></a>
<FONT color="green">009</FONT>     *      http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a>
<FONT color="green">010</FONT>     *<a name="line.10"></a>
<FONT color="green">011</FONT>     * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a>
<FONT color="green">012</FONT>     * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a>
<FONT color="green">013</FONT>     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a>
<FONT color="green">014</FONT>     * See the License for the specific language governing permissions and<a name="line.14"></a>
<FONT color="green">015</FONT>     * limitations under the License.<a name="line.15"></a>
<FONT color="green">016</FONT>     */<a name="line.16"></a>
<FONT color="green">017</FONT>    package org.apache.commons.lang3.concurrent;<a name="line.17"></a>
<FONT color="green">018</FONT>    <a name="line.18"></a>
<FONT color="green">019</FONT>    import java.util.Collections;<a name="line.19"></a>
<FONT color="green">020</FONT>    import java.util.HashMap;<a name="line.20"></a>
<FONT color="green">021</FONT>    import java.util.Map;<a name="line.21"></a>
<FONT color="green">022</FONT>    import java.util.NoSuchElementException;<a name="line.22"></a>
<FONT color="green">023</FONT>    import java.util.Set;<a name="line.23"></a>
<FONT color="green">024</FONT>    import java.util.concurrent.ExecutorService;<a name="line.24"></a>
<FONT color="green">025</FONT>    <a name="line.25"></a>
<FONT color="green">026</FONT>    /**<a name="line.26"></a>
<FONT color="green">027</FONT>     * &lt;p&gt;<a name="line.27"></a>
<FONT color="green">028</FONT>     * A specialized {@link BackgroundInitializer} implementation that can deal with<a name="line.28"></a>
<FONT color="green">029</FONT>     * multiple background initialization tasks.<a name="line.29"></a>
<FONT color="green">030</FONT>     * &lt;/p&gt;<a name="line.30"></a>
<FONT color="green">031</FONT>     * &lt;p&gt;<a name="line.31"></a>
<FONT color="green">032</FONT>     * This class has a similar purpose as {@link BackgroundInitializer}. However,<a name="line.32"></a>
<FONT color="green">033</FONT>     * it is not limited to a single background initialization task. Rather it<a name="line.33"></a>
<FONT color="green">034</FONT>     * manages an arbitrary number of {@code BackgroundInitializer} objects,<a name="line.34"></a>
<FONT color="green">035</FONT>     * executes them, and waits until they are completely initialized. This is<a name="line.35"></a>
<FONT color="green">036</FONT>     * useful for applications that have to perform multiple initialization tasks<a name="line.36"></a>
<FONT color="green">037</FONT>     * that can run in parallel (i.e. that do not depend on each other). This class<a name="line.37"></a>
<FONT color="green">038</FONT>     * takes care about the management of an {@code ExecutorService} and shares it<a name="line.38"></a>
<FONT color="green">039</FONT>     * with the {@code BackgroundInitializer} objects it is responsible for; so the<a name="line.39"></a>
<FONT color="green">040</FONT>     * using application need not bother with these details.<a name="line.40"></a>
<FONT color="green">041</FONT>     * &lt;/p&gt;<a name="line.41"></a>
<FONT color="green">042</FONT>     * &lt;p&gt;<a name="line.42"></a>
<FONT color="green">043</FONT>     * The typical usage scenario for {@code MultiBackgroundInitializer} is as<a name="line.43"></a>
<FONT color="green">044</FONT>     * follows:<a name="line.44"></a>
<FONT color="green">045</FONT>     * &lt;ul&gt;<a name="line.45"></a>
<FONT color="green">046</FONT>     * &lt;li&gt;Create a new instance of the class. Optionally pass in a pre-configured<a name="line.46"></a>
<FONT color="green">047</FONT>     * {@code ExecutorService}. Alternatively {@code MultiBackgroundInitializer} can<a name="line.47"></a>
<FONT color="green">048</FONT>     * create a temporary {@code ExecutorService} and delete it after initialization<a name="line.48"></a>
<FONT color="green">049</FONT>     * is complete.&lt;/li&gt;<a name="line.49"></a>
<FONT color="green">050</FONT>     * &lt;li&gt;Create specialized {@link BackgroundInitializer} objects for the<a name="line.50"></a>
<FONT color="green">051</FONT>     * initialization tasks to be performed and add them to the {@code<a name="line.51"></a>
<FONT color="green">052</FONT>     * MultiBackgroundInitializer} using the<a name="line.52"></a>
<FONT color="green">053</FONT>     * {@link #addInitializer(String, BackgroundInitializer)} method.&lt;/li&gt;<a name="line.53"></a>
<FONT color="green">054</FONT>     * &lt;li&gt;After all initializers have been added, call the {@link #start()} method.<a name="line.54"></a>
<FONT color="green">055</FONT>     * &lt;/li&gt;<a name="line.55"></a>
<FONT color="green">056</FONT>     * &lt;li&gt;When access to the result objects produced by the {@code<a name="line.56"></a>
<FONT color="green">057</FONT>     * BackgroundInitializer} objects is needed call the {@link #get()} method. The<a name="line.57"></a>
<FONT color="green">058</FONT>     * object returned here provides access to all result objects created during<a name="line.58"></a>
<FONT color="green">059</FONT>     * initialization. It also stores information about exceptions that have<a name="line.59"></a>
<FONT color="green">060</FONT>     * occurred.&lt;/li&gt;<a name="line.60"></a>
<FONT color="green">061</FONT>     * &lt;/ul&gt;<a name="line.61"></a>
<FONT color="green">062</FONT>     * &lt;/p&gt;<a name="line.62"></a>
<FONT color="green">063</FONT>     * &lt;p&gt;<a name="line.63"></a>
<FONT color="green">064</FONT>     * {@code MultiBackgroundInitializer} starts a special controller task that<a name="line.64"></a>
<FONT color="green">065</FONT>     * starts all {@code BackgroundInitializer} objects added to the instance.<a name="line.65"></a>
<FONT color="green">066</FONT>     * Before the an initializer is started it is checked whether this initializer<a name="line.66"></a>
<FONT color="green">067</FONT>     * already has an {@code ExecutorService} set. If this is the case, this {@code<a name="line.67"></a>
<FONT color="green">068</FONT>     * ExecutorService} is used for running the background task. Otherwise the<a name="line.68"></a>
<FONT color="green">069</FONT>     * current {@code ExecutorService} of this {@code MultiBackgroundInitializer} is<a name="line.69"></a>
<FONT color="green">070</FONT>     * shared with the initializer.<a name="line.70"></a>
<FONT color="green">071</FONT>     * &lt;/p&gt;<a name="line.71"></a>
<FONT color="green">072</FONT>     * &lt;p&gt;<a name="line.72"></a>
<FONT color="green">073</FONT>     * The easiest way of using this class is to let it deal with the management of<a name="line.73"></a>
<FONT color="green">074</FONT>     * an {@code ExecutorService} itself: If no external {@code ExecutorService} is<a name="line.74"></a>
<FONT color="green">075</FONT>     * provided, the class creates a temporary {@code ExecutorService} (that is<a name="line.75"></a>
<FONT color="green">076</FONT>     * capable of executing all background tasks in parallel) and destroys it at the<a name="line.76"></a>
<FONT color="green">077</FONT>     * end of background processing.<a name="line.77"></a>
<FONT color="green">078</FONT>     * &lt;/p&gt;<a name="line.78"></a>
<FONT color="green">079</FONT>     * &lt;p&gt;<a name="line.79"></a>
<FONT color="green">080</FONT>     * Alternatively an external {@code ExecutorService} can be provided - either at<a name="line.80"></a>
<FONT color="green">081</FONT>     * construction time or later by calling the<a name="line.81"></a>
<FONT color="green">082</FONT>     * {@link #setExternalExecutor(ExecutorService)} method. In this case all<a name="line.82"></a>
<FONT color="green">083</FONT>     * background tasks are scheduled at this external {@code ExecutorService}.<a name="line.83"></a>
<FONT color="green">084</FONT>     * &lt;strong&gt;Important note:&lt;/strong&gt; When using an external {@code<a name="line.84"></a>
<FONT color="green">085</FONT>     * ExecutorService} be sure that the number of threads managed by the service is<a name="line.85"></a>
<FONT color="green">086</FONT>     * large enough. Otherwise a deadlock can happen! This is the case in the<a name="line.86"></a>
<FONT color="green">087</FONT>     * following scenario: {@code MultiBackgroundInitializer} starts a task that<a name="line.87"></a>
<FONT color="green">088</FONT>     * starts all registered {@code BackgroundInitializer} objects and waits for<a name="line.88"></a>
<FONT color="green">089</FONT>     * their completion. If for instance a single threaded {@code ExecutorService}<a name="line.89"></a>
<FONT color="green">090</FONT>     * is used, none of the background tasks can be executed, and the task created<a name="line.90"></a>
<FONT color="green">091</FONT>     * by {@code MultiBackgroundInitializer} waits forever.<a name="line.91"></a>
<FONT color="green">092</FONT>     * &lt;/p&gt;<a name="line.92"></a>
<FONT color="green">093</FONT>     *<a name="line.93"></a>
<FONT color="green">094</FONT>     * @since 3.0<a name="line.94"></a>
<FONT color="green">095</FONT>     * @version $Id: MultiBackgroundInitializer.java 1082301 2011-03-16 21:02:15Z oheger $<a name="line.95"></a>
<FONT color="green">096</FONT>     */<a name="line.96"></a>
<FONT color="green">097</FONT>    public class MultiBackgroundInitializer<a name="line.97"></a>
<FONT color="green">098</FONT>            extends<a name="line.98"></a>
<FONT color="green">099</FONT>            BackgroundInitializer&lt;MultiBackgroundInitializer.MultiBackgroundInitializerResults&gt; {<a name="line.99"></a>
<FONT color="green">100</FONT>        /** A map with the child initializers. */<a name="line.100"></a>
<FONT color="green">101</FONT>        private final Map&lt;String, BackgroundInitializer&lt;?&gt;&gt; childInitializers =<a name="line.101"></a>
<FONT color="green">102</FONT>            new HashMap&lt;String, BackgroundInitializer&lt;?&gt;&gt;();<a name="line.102"></a>
<FONT color="green">103</FONT>    <a name="line.103"></a>
<FONT color="green">104</FONT>        /**<a name="line.104"></a>
<FONT color="green">105</FONT>         * Creates a new instance of {@code MultiBackgroundInitializer}.<a name="line.105"></a>
<FONT color="green">106</FONT>         */<a name="line.106"></a>
<FONT color="green">107</FONT>        public MultiBackgroundInitializer() {<a name="line.107"></a>
<FONT color="green">108</FONT>            super();<a name="line.108"></a>
<FONT color="green">109</FONT>        }<a name="line.109"></a>
<FONT color="green">110</FONT>    <a name="line.110"></a>
<FONT color="green">111</FONT>        /**<a name="line.111"></a>
<FONT color="green">112</FONT>         * Creates a new instance of {@code MultiBackgroundInitializer} and<a name="line.112"></a>
<FONT color="green">113</FONT>         * initializes it with the given external {@code ExecutorService}.<a name="line.113"></a>
<FONT color="green">114</FONT>         *<a name="line.114"></a>
<FONT color="green">115</FONT>         * @param exec the {@code ExecutorService} for executing the background<a name="line.115"></a>
<FONT color="green">116</FONT>         * tasks<a name="line.116"></a>
<FONT color="green">117</FONT>         */<a name="line.117"></a>
<FONT color="green">118</FONT>        public MultiBackgroundInitializer(ExecutorService exec) {<a name="line.118"></a>
<FONT color="green">119</FONT>            super(exec);<a name="line.119"></a>
<FONT color="green">120</FONT>        }<a name="line.120"></a>
<FONT color="green">121</FONT>    <a name="line.121"></a>
<FONT color="green">122</FONT>        /**<a name="line.122"></a>
<FONT color="green">123</FONT>         * Adds a new {@code BackgroundInitializer} to this object. When this<a name="line.123"></a>
<FONT color="green">124</FONT>         * {@code MultiBackgroundInitializer} is started, the given initializer will<a name="line.124"></a>
<FONT color="green">125</FONT>         * be processed. This method must not be called after {@link #start()} has<a name="line.125"></a>
<FONT color="green">126</FONT>         * been invoked.<a name="line.126"></a>
<FONT color="green">127</FONT>         *<a name="line.127"></a>
<FONT color="green">128</FONT>         * @param name the name of the initializer (must not be &lt;b&gt;null&lt;/b&gt;)<a name="line.128"></a>
<FONT color="green">129</FONT>         * @param init the {@code BackgroundInitializer} to add (must not be<a name="line.129"></a>
<FONT color="green">130</FONT>         * &lt;b&gt;null&lt;/b&gt;)<a name="line.130"></a>
<FONT color="green">131</FONT>         * @throws IllegalArgumentException if a required parameter is missing<a name="line.131"></a>
<FONT color="green">132</FONT>         * @throws IllegalStateException if {@code start()} has already been called<a name="line.132"></a>
<FONT color="green">133</FONT>         */<a name="line.133"></a>
<FONT color="green">134</FONT>        public void addInitializer(String name, BackgroundInitializer&lt;?&gt; init) {<a name="line.134"></a>
<FONT color="green">135</FONT>            if (name == null) {<a name="line.135"></a>
<FONT color="green">136</FONT>                throw new IllegalArgumentException(<a name="line.136"></a>
<FONT color="green">137</FONT>                        "Name of child initializer must not be null!");<a name="line.137"></a>
<FONT color="green">138</FONT>            }<a name="line.138"></a>
<FONT color="green">139</FONT>            if (init == null) {<a name="line.139"></a>
<FONT color="green">140</FONT>                throw new IllegalArgumentException(<a name="line.140"></a>
<FONT color="green">141</FONT>                        "Child initializer must not be null!");<a name="line.141"></a>
<FONT color="green">142</FONT>            }<a name="line.142"></a>
<FONT color="green">143</FONT>    <a name="line.143"></a>
<FONT color="green">144</FONT>            synchronized (this) {<a name="line.144"></a>
<FONT color="green">145</FONT>                if (isStarted()) {<a name="line.145"></a>
<FONT color="green">146</FONT>                    throw new IllegalStateException(<a name="line.146"></a>
<FONT color="green">147</FONT>                            "addInitializer() must not be called after start()!");<a name="line.147"></a>
<FONT color="green">148</FONT>                }<a name="line.148"></a>
<FONT color="green">149</FONT>                childInitializers.put(name, init);<a name="line.149"></a>
<FONT color="green">150</FONT>            }<a name="line.150"></a>
<FONT color="green">151</FONT>        }<a name="line.151"></a>
<FONT color="green">152</FONT>    <a name="line.152"></a>
<FONT color="green">153</FONT>        /**<a name="line.153"></a>
<FONT color="green">154</FONT>         * Returns the number of tasks needed for executing all child {@code<a name="line.154"></a>
<FONT color="green">155</FONT>         * BackgroundInitializer} objects in parallel. This implementation sums up<a name="line.155"></a>
<FONT color="green">156</FONT>         * the required tasks for all child initializers (which is necessary if one<a name="line.156"></a>
<FONT color="green">157</FONT>         * of the child initializers is itself a {@code MultiBackgroundInitializer}<a name="line.157"></a>
<FONT color="green">158</FONT>         * ). Then it adds 1 for the control task that waits for the completion of<a name="line.158"></a>
<FONT color="green">159</FONT>         * the children.<a name="line.159"></a>
<FONT color="green">160</FONT>         *<a name="line.160"></a>
<FONT color="green">161</FONT>         * @return the number of tasks required for background processing<a name="line.161"></a>
<FONT color="green">162</FONT>         */<a name="line.162"></a>
<FONT color="green">163</FONT>        @Override<a name="line.163"></a>
<FONT color="green">164</FONT>        protected int getTaskCount() {<a name="line.164"></a>
<FONT color="green">165</FONT>            int result = 1;<a name="line.165"></a>
<FONT color="green">166</FONT>    <a name="line.166"></a>
<FONT color="green">167</FONT>            for (BackgroundInitializer&lt;?&gt; bi : childInitializers.values()) {<a name="line.167"></a>
<FONT color="green">168</FONT>                result += bi.getTaskCount();<a name="line.168"></a>
<FONT color="green">169</FONT>            }<a name="line.169"></a>
<FONT color="green">170</FONT>    <a name="line.170"></a>
<FONT color="green">171</FONT>            return result;<a name="line.171"></a>
<FONT color="green">172</FONT>        }<a name="line.172"></a>
<FONT color="green">173</FONT>    <a name="line.173"></a>
<FONT color="green">174</FONT>        /**<a name="line.174"></a>
<FONT color="green">175</FONT>         * Creates the results object. This implementation starts all child {@code<a name="line.175"></a>
<FONT color="green">176</FONT>         * BackgroundInitializer} objects. Then it collects their results and<a name="line.176"></a>
<FONT color="green">177</FONT>         * creates a {@code MultiBackgroundInitializerResults} object with this<a name="line.177"></a>
<FONT color="green">178</FONT>         * data. If a child initializer throws a checked exceptions, it is added to<a name="line.178"></a>
<FONT color="green">179</FONT>         * the results object. Unchecked exceptions are propagated.<a name="line.179"></a>
<FONT color="green">180</FONT>         *<a name="line.180"></a>
<FONT color="green">181</FONT>         * @return the results object<a name="line.181"></a>
<FONT color="green">182</FONT>         * @throws Exception if an error occurs<a name="line.182"></a>
<FONT color="green">183</FONT>         */<a name="line.183"></a>
<FONT color="green">184</FONT>        @Override<a name="line.184"></a>
<FONT color="green">185</FONT>        protected MultiBackgroundInitializerResults initialize() throws Exception {<a name="line.185"></a>
<FONT color="green">186</FONT>            Map&lt;String, BackgroundInitializer&lt;?&gt;&gt; inits;<a name="line.186"></a>
<FONT color="green">187</FONT>            synchronized (this) {<a name="line.187"></a>
<FONT color="green">188</FONT>                // create a snapshot to operate on<a name="line.188"></a>
<FONT color="green">189</FONT>                inits = new HashMap&lt;String, BackgroundInitializer&lt;?&gt;&gt;(<a name="line.189"></a>
<FONT color="green">190</FONT>                        childInitializers);<a name="line.190"></a>
<FONT color="green">191</FONT>            }<a name="line.191"></a>
<FONT color="green">192</FONT>    <a name="line.192"></a>
<FONT color="green">193</FONT>            // start the child initializers<a name="line.193"></a>
<FONT color="green">194</FONT>            ExecutorService exec = getActiveExecutor();<a name="line.194"></a>
<FONT color="green">195</FONT>            for (BackgroundInitializer&lt;?&gt; bi : inits.values()) {<a name="line.195"></a>
<FONT color="green">196</FONT>                if (bi.getExternalExecutor() == null) {<a name="line.196"></a>
<FONT color="green">197</FONT>                    // share the executor service if necessary<a name="line.197"></a>
<FONT color="green">198</FONT>                    bi.setExternalExecutor(exec);<a name="line.198"></a>
<FONT color="green">199</FONT>                }<a name="line.199"></a>
<FONT color="green">200</FONT>                bi.start();<a name="line.200"></a>
<FONT color="green">201</FONT>            }<a name="line.201"></a>
<FONT color="green">202</FONT>    <a name="line.202"></a>
<FONT color="green">203</FONT>            // collect the results<a name="line.203"></a>
<FONT color="green">204</FONT>            Map&lt;String, Object&gt; results = new HashMap&lt;String, Object&gt;();<a name="line.204"></a>
<FONT color="green">205</FONT>            Map&lt;String, ConcurrentException&gt; excepts = new HashMap&lt;String, ConcurrentException&gt;();<a name="line.205"></a>
<FONT color="green">206</FONT>            for (Map.Entry&lt;String, BackgroundInitializer&lt;?&gt;&gt; e : inits.entrySet()) {<a name="line.206"></a>
<FONT color="green">207</FONT>                try {<a name="line.207"></a>
<FONT color="green">208</FONT>                    results.put(e.getKey(), e.getValue().get());<a name="line.208"></a>
<FONT color="green">209</FONT>                } catch (ConcurrentException cex) {<a name="line.209"></a>
<FONT color="green">210</FONT>                    excepts.put(e.getKey(), cex);<a name="line.210"></a>
<FONT color="green">211</FONT>                }<a name="line.211"></a>
<FONT color="green">212</FONT>            }<a name="line.212"></a>
<FONT color="green">213</FONT>    <a name="line.213"></a>
<FONT color="green">214</FONT>            return new MultiBackgroundInitializerResults(inits, results, excepts);<a name="line.214"></a>
<FONT color="green">215</FONT>        }<a name="line.215"></a>
<FONT color="green">216</FONT>    <a name="line.216"></a>
<FONT color="green">217</FONT>        /**<a name="line.217"></a>
<FONT color="green">218</FONT>         * A data class for storing the results of the background initialization<a name="line.218"></a>
<FONT color="green">219</FONT>         * performed by {@code MultiBackgroundInitializer}. Objects of this inner<a name="line.219"></a>
<FONT color="green">220</FONT>         * class are returned by {@link MultiBackgroundInitializer#initialize()}.<a name="line.220"></a>
<FONT color="green">221</FONT>         * They allow access to all result objects produced by the<a name="line.221"></a>
<FONT color="green">222</FONT>         * {@link BackgroundInitializer} objects managed by the owning instance. It<a name="line.222"></a>
<FONT color="green">223</FONT>         * is also possible to retrieve status information about single<a name="line.223"></a>
<FONT color="green">224</FONT>         * {@link BackgroundInitializer}s, i.e. whether they completed normally or<a name="line.224"></a>
<FONT color="green">225</FONT>         * caused an exception.<a name="line.225"></a>
<FONT color="green">226</FONT>         */<a name="line.226"></a>
<FONT color="green">227</FONT>        public static class MultiBackgroundInitializerResults {<a name="line.227"></a>
<FONT color="green">228</FONT>            /** A map with the child initializers. */<a name="line.228"></a>
<FONT color="green">229</FONT>            private final Map&lt;String, BackgroundInitializer&lt;?&gt;&gt; initializers;<a name="line.229"></a>
<FONT color="green">230</FONT>    <a name="line.230"></a>
<FONT color="green">231</FONT>            /** A map with the result objects. */<a name="line.231"></a>
<FONT color="green">232</FONT>            private final Map&lt;String, Object&gt; resultObjects;<a name="line.232"></a>
<FONT color="green">233</FONT>    <a name="line.233"></a>
<FONT color="green">234</FONT>            /** A map with the exceptions. */<a name="line.234"></a>
<FONT color="green">235</FONT>            private final Map&lt;String, ConcurrentException&gt; exceptions;<a name="line.235"></a>
<FONT color="green">236</FONT>    <a name="line.236"></a>
<FONT color="green">237</FONT>            /**<a name="line.237"></a>
<FONT color="green">238</FONT>             * Creates a new instance of {@code MultiBackgroundInitializerResults}<a name="line.238"></a>
<FONT color="green">239</FONT>             * and initializes it with maps for the {@code BackgroundInitializer}<a name="line.239"></a>
<FONT color="green">240</FONT>             * objects, their result objects and the exceptions thrown by them.<a name="line.240"></a>
<FONT color="green">241</FONT>             *<a name="line.241"></a>
<FONT color="green">242</FONT>             * @param inits the {@code BackgroundInitializer} objects<a name="line.242"></a>
<FONT color="green">243</FONT>             * @param results the result objects<a name="line.243"></a>
<FONT color="green">244</FONT>             * @param excepts the exceptions<a name="line.244"></a>
<FONT color="green">245</FONT>             */<a name="line.245"></a>
<FONT color="green">246</FONT>            private MultiBackgroundInitializerResults(<a name="line.246"></a>
<FONT color="green">247</FONT>                    Map&lt;String, BackgroundInitializer&lt;?&gt;&gt; inits,<a name="line.247"></a>
<FONT color="green">248</FONT>                    Map&lt;String, Object&gt; results,<a name="line.248"></a>
<FONT color="green">249</FONT>                    Map&lt;String, ConcurrentException&gt; excepts) {<a name="line.249"></a>
<FONT color="green">250</FONT>                initializers = inits;<a name="line.250"></a>
<FONT color="green">251</FONT>                resultObjects = results;<a name="line.251"></a>
<FONT color="green">252</FONT>                exceptions = excepts;<a name="line.252"></a>
<FONT color="green">253</FONT>            }<a name="line.253"></a>
<FONT color="green">254</FONT>    <a name="line.254"></a>
<FONT color="green">255</FONT>            /**<a name="line.255"></a>
<FONT color="green">256</FONT>             * Returns the {@code BackgroundInitializer} with the given name. If the<a name="line.256"></a>
<FONT color="green">257</FONT>             * name cannot be resolved, an exception is thrown.<a name="line.257"></a>
<FONT color="green">258</FONT>             *<a name="line.258"></a>
<FONT color="green">259</FONT>             * @param name the name of the {@code BackgroundInitializer}<a name="line.259"></a>
<FONT color="green">260</FONT>             * @return the {@code BackgroundInitializer} with this name<a name="line.260"></a>
<FONT color="green">261</FONT>             * @throws NoSuchElementException if the name cannot be resolved<a name="line.261"></a>
<FONT color="green">262</FONT>             */<a name="line.262"></a>
<FONT color="green">263</FONT>            public BackgroundInitializer&lt;?&gt; getInitializer(String name) {<a name="line.263"></a>
<FONT color="green">264</FONT>                return checkName(name);<a name="line.264"></a>
<FONT color="green">265</FONT>            }<a name="line.265"></a>
<FONT color="green">266</FONT>    <a name="line.266"></a>
<FONT color="green">267</FONT>            /**<a name="line.267"></a>
<FONT color="green">268</FONT>             * Returns the result object produced by the {@code<a name="line.268"></a>
<FONT color="green">269</FONT>             * BackgroundInitializer} with the given name. This is the object<a name="line.269"></a>
<FONT color="green">270</FONT>             * returned by the initializer's {@code initialize()} method. If this<a name="line.270"></a>
<FONT color="green">271</FONT>             * {@code BackgroundInitializer} caused an exception, &lt;b&gt;null&lt;/b&gt; is<a name="line.271"></a>
<FONT color="green">272</FONT>             * returned. If the name cannot be resolved, an exception is thrown.<a name="line.272"></a>
<FONT color="green">273</FONT>             *<a name="line.273"></a>
<FONT color="green">274</FONT>             * @param name the name of the {@code BackgroundInitializer}<a name="line.274"></a>
<FONT color="green">275</FONT>             * @return the result object produced by this {@code<a name="line.275"></a>
<FONT color="green">276</FONT>             * BackgroundInitializer}<a name="line.276"></a>
<FONT color="green">277</FONT>             * @throws NoSuchElementException if the name cannot be resolved<a name="line.277"></a>
<FONT color="green">278</FONT>             */<a name="line.278"></a>
<FONT color="green">279</FONT>            public Object getResultObject(String name) {<a name="line.279"></a>
<FONT color="green">280</FONT>                checkName(name);<a name="line.280"></a>
<FONT color="green">281</FONT>                return resultObjects.get(name);<a name="line.281"></a>
<FONT color="green">282</FONT>            }<a name="line.282"></a>
<FONT color="green">283</FONT>    <a name="line.283"></a>
<FONT color="green">284</FONT>            /**<a name="line.284"></a>
<FONT color="green">285</FONT>             * Returns a flag whether the {@code BackgroundInitializer} with the<a name="line.285"></a>
<FONT color="green">286</FONT>             * given name caused an exception.<a name="line.286"></a>
<FONT color="green">287</FONT>             *<a name="line.287"></a>
<FONT color="green">288</FONT>             * @param name the name of the {@code BackgroundInitializer}<a name="line.288"></a>
<FONT color="green">289</FONT>             * @return a flag whether this initializer caused an exception<a name="line.289"></a>
<FONT color="green">290</FONT>             * @throws NoSuchElementException if the name cannot be resolved<a name="line.290"></a>
<FONT color="green">291</FONT>             */<a name="line.291"></a>
<FONT color="green">292</FONT>            public boolean isException(String name) {<a name="line.292"></a>
<FONT color="green">293</FONT>                checkName(name);<a name="line.293"></a>
<FONT color="green">294</FONT>                return exceptions.containsKey(name);<a name="line.294"></a>
<FONT color="green">295</FONT>            }<a name="line.295"></a>
<FONT color="green">296</FONT>    <a name="line.296"></a>
<FONT color="green">297</FONT>            /**<a name="line.297"></a>
<FONT color="green">298</FONT>             * Returns the {@code ConcurrentException} object that was thrown by the<a name="line.298"></a>
<FONT color="green">299</FONT>             * {@code BackgroundInitializer} with the given name. If this<a name="line.299"></a>
<FONT color="green">300</FONT>             * initializer did not throw an exception, the return value is<a name="line.300"></a>
<FONT color="green">301</FONT>             * &lt;b&gt;null&lt;/b&gt;. If the name cannot be resolved, an exception is thrown.<a name="line.301"></a>
<FONT color="green">302</FONT>             *<a name="line.302"></a>
<FONT color="green">303</FONT>             * @param name the name of the {@code BackgroundInitializer}<a name="line.303"></a>
<FONT color="green">304</FONT>             * @return the exception thrown by this initializer<a name="line.304"></a>
<FONT color="green">305</FONT>             * @throws NoSuchElementException if the name cannot be resolved<a name="line.305"></a>
<FONT color="green">306</FONT>             */<a name="line.306"></a>
<FONT color="green">307</FONT>            public ConcurrentException getException(String name) {<a name="line.307"></a>
<FONT color="green">308</FONT>                checkName(name);<a name="line.308"></a>
<FONT color="green">309</FONT>                return exceptions.get(name);<a name="line.309"></a>
<FONT color="green">310</FONT>            }<a name="line.310"></a>
<FONT color="green">311</FONT>    <a name="line.311"></a>
<FONT color="green">312</FONT>            /**<a name="line.312"></a>
<FONT color="green">313</FONT>             * Returns a set with the names of all {@code BackgroundInitializer}<a name="line.313"></a>
<FONT color="green">314</FONT>             * objects managed by the {@code MultiBackgroundInitializer}.<a name="line.314"></a>
<FONT color="green">315</FONT>             *<a name="line.315"></a>
<FONT color="green">316</FONT>             * @return an (unmodifiable) set with the names of the managed {@code<a name="line.316"></a>
<FONT color="green">317</FONT>             * BackgroundInitializer} objects<a name="line.317"></a>
<FONT color="green">318</FONT>             */<a name="line.318"></a>
<FONT color="green">319</FONT>            public Set&lt;String&gt; initializerNames() {<a name="line.319"></a>
<FONT color="green">320</FONT>                return Collections.unmodifiableSet(initializers.keySet());<a name="line.320"></a>
<FONT color="green">321</FONT>            }<a name="line.321"></a>
<FONT color="green">322</FONT>    <a name="line.322"></a>
<FONT color="green">323</FONT>            /**<a name="line.323"></a>
<FONT color="green">324</FONT>             * Returns a flag whether the whole initialization was successful. This<a name="line.324"></a>
<FONT color="green">325</FONT>             * is the case if no child initializer has thrown an exception.<a name="line.325"></a>
<FONT color="green">326</FONT>             *<a name="line.326"></a>
<FONT color="green">327</FONT>             * @return a flag whether the initialization was successful<a name="line.327"></a>
<FONT color="green">328</FONT>             */<a name="line.328"></a>
<FONT color="green">329</FONT>            public boolean isSuccessful() {<a name="line.329"></a>
<FONT color="green">330</FONT>                return exceptions.isEmpty();<a name="line.330"></a>
<FONT color="green">331</FONT>            }<a name="line.331"></a>
<FONT color="green">332</FONT>    <a name="line.332"></a>
<FONT color="green">333</FONT>            /**<a name="line.333"></a>
<FONT color="green">334</FONT>             * Checks whether an initializer with the given name exists. If not,<a name="line.334"></a>
<FONT color="green">335</FONT>             * throws an exception. If it exists, the associated child initializer<a name="line.335"></a>
<FONT color="green">336</FONT>             * is returned.<a name="line.336"></a>
<FONT color="green">337</FONT>             *<a name="line.337"></a>
<FONT color="green">338</FONT>             * @param name the name to check<a name="line.338"></a>
<FONT color="green">339</FONT>             * @return the initializer with this name<a name="line.339"></a>
<FONT color="green">340</FONT>             * @throws NoSuchElementException if the name is unknown<a name="line.340"></a>
<FONT color="green">341</FONT>             */<a name="line.341"></a>
<FONT color="green">342</FONT>            private BackgroundInitializer&lt;?&gt; checkName(String name) {<a name="line.342"></a>
<FONT color="green">343</FONT>                BackgroundInitializer&lt;?&gt; init = initializers.get(name);<a name="line.343"></a>
<FONT color="green">344</FONT>                if (init == null) {<a name="line.344"></a>
<FONT color="green">345</FONT>                    throw new NoSuchElementException(<a name="line.345"></a>
<FONT color="green">346</FONT>                            "No child initializer with name " + name);<a name="line.346"></a>
<FONT color="green">347</FONT>                }<a name="line.347"></a>
<FONT color="green">348</FONT>    <a name="line.348"></a>
<FONT color="green">349</FONT>                return init;<a name="line.349"></a>
<FONT color="green">350</FONT>            }<a name="line.350"></a>
<FONT color="green">351</FONT>        }<a name="line.351"></a>
<FONT color="green">352</FONT>    }<a name="line.352"></a>




























































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